Take maida in a bowl, add salt, baking powder and sugar to it. Whisk it well. Now add butter.
Rub it with your fingers, it will look more like breadcrumbs. Now add few drops of water and bring it together to form a soft non sticky dough.
Cling wrap it and refrigerate it for at least 30mins.
Take the dough from the fridge and roll it slightly thin and even to about 1/4inch thickness , cut small squares slightly bigger than your tart moulds.
Prepare your tart moulds, brush it well with melted butter. Set aside.
Lay the dough on the tart mould. Trim the extras and line it well.
Now scrap the remaining dough and repeat the process till the entire dough finishes.
Now the tart moulds are neatly lined.
Arrange it in a baking tray and prick each tart using a fork.
Preheat oven at 180 deg C.
Bake in preheated oven at the same temperature for 12-15mins or until the edges are golden.
Cool down the tarts completely.